Process of producing colobed lime



" a slam 'n rnnrrnron GEQRGE S. KECKQOF SPRINGFIELD, OHID.

EROCESS 0F PRODUCING COLORED LIME.

L\To Drawing.

To'aZZ whom it may concern.- Q

-Be it known that I, Gnonen S. Knox, a

citizen of the 'United States, residing at Springfield, in the county of Clark and State of Ohio, have invented certain new be tinted or colored and attemptshave been made to color the lime when it is mixed with the other ingredients preparatory to apply ing it to the walls. This process, however,

of placing the coloring in the mixture when has not been wholly successful, as almost invariably the color will be unevenly mixed and the wall will be streaked. This is particularly true where a smooth finish is applied to the wall. If the wall has a roughened surface the unevenness and streakiness of the color is not so present.

In order to overcome this-dificulty and provide a uniformly tinted coating for the walls or other surfaces it,is the object of the invention toproduce a lime having the apparent but it is still coloring matter incorporated therein during the process of its manufacture, thereby insuring a uniform distribution of the color in the lime and enabling the tintdesired to be selected before the mixture is made.

In carrying out my invention I have applied the same to what is known as hydrated lime. As is well known lime comes from, the kiln in lumps and in order to place the same upon the market in a powered condition it must be treated in some manner.

A very common treatment is what is known as hydration, which consists in grinding the and drying apparatus, commonly known as Specification of Letters Patent Patented Aug 15 1916, Application filed. August 28, 1913. Serial No. 787,219.

a hydrator, may be of various kinds; One well known hydrator comprises a series of 'ing is effected by the heat generated by the mlxture of the lime with the water, which heat is sufiicient to thoroughly dry the lime before it leaves the hydrator. It is not to be understood, of course, that the lime is ghemlcally dry but that it is commercially In order that the coloring matter may be properly incorporated in the lime I prefer to add the same thereto during some step of the process of pulverization, which,

in the present instance, is the process of it is prepared for application to the walls hydration; More or less satisfactory results may be obtained by applying the coloring matter at different times during this process-hut onevery satisfactory method consists 1n adding .the coloring matter to the quantity of water which is to be mixed with the lime during the process of hydration and before the water is added to the lime. In this manner'the coloring matter is carried to every particle of the lime and is thoroughly and uniformly incorporated .therewith and when dry and screened the product is perfectly smooth and of an absolutely uniform coloring and the most delicate tints of any shade or color may be secured. However,if the, coloring matter is mixed with the lime and Water in the hy- .drator, the hydrating operation will cause it to be verytthoroughly incorporated withv the lime and a smooth uniform product will be had. A wide variation of'colors may be secured, this being accomplished, of course, by varying the character and amount of coloring matter employed. Various coloring matters can be used and the amount of coloring matter employed to secure a specified the lime the color of the finished product,"

butin practice I find that a specified quantity of a given coloring matter, say, five pounds to forty gallons. of water, will always produce the same tint in a given quantity of the finished product. While the amount of coloring matter added to the water to color a given amount of lime will vary with the different coloring matters used the'following may be given as an example: If fifty pounds of raw sienna is mixed withfifty gallons of water and the resulting mixture is used in the hydration of about fifteen hundred pounds of lime there will be obtained a hydrated lime of a pale yellow tint. By increasing or decreasing the percentage of dry color the color of the hydrated lime Will be proportionatelydarker or lighter.

ished is substantially of the same character The product when finas the hydrated lime of commerce, and the product is handled and applied in essentially the same manner as the hydrated lime.

It will be understood that while I have described the process of producing this product this process may be varied to a greater or less extent without departing from the essential principles thereof. For

example, the coloring may, as above stated,

be applied to the lime at different steps in the course of its preparation for the market.

Having thus fully described my inven- 'tion, what I claim as new and desire to secure by Letters Patent, is

1. The process of producing uniformly colored hydrated lime consisting in uniformly disseminating coloring matter throughout a body of Water, adding only enough of. such water to unhydrated lime to hydrate the lime and leave it in the form of a dry powder, and thoroughly mixing the lime and water during hydration.

'2. The process of producing uniformly colored hydrated lime, consisting in placing together in a hydrator the lime to be hydrated, and only enough water to hydrate the lime and leave it in the form of dry powder and enough coloring matter to produce the desired color, and thoroughly mixing the same to cause the water to combine with the lime, to uniformly incorporate the I coloring matterwith the lime and to cause the colored lime to be dried in the form of a powder by the heat generated in the hydrator by the mixture of the lime and water.

In testimony whereof, I aflix my signature in. presence of two witnesses.

GEORGE s. KEOK. 

